Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9eb9ecf462086b…

MALICIOUS

PDF

77.7 KB Created: 2021-03-04 20:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cbd9515744cbd63cd5c6b44196d1672f SHA-1: c0109264b726ea858c306ea32c5d3443e0c97e75 SHA-256: ff9eb9ecf462086b52f15911d57def06278bc5e399f038171053c4a4aeb19b31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. Heuristics and ML classification strongly suggest malicious intent, specifically phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/award?keyword=simpson+3300+psi+pressure+washer+owners+manual PDF link annotation
    • http://xosubowavenu.mypressonline.com/47323549116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367938/normal_5ffd9fb42a504.pdfIn PDF document text
    • http://wiwajekirutiw.scienceontheweb.net/76758463973.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/larijire.pdfIn PDF document text
    • http://kurixuj.sportsontheweb.net/medegujawo.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/first_aid_2017_corrections_2018.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/ratojisavidu.pdfIn PDF document text
    • https://diwekapuxejube.weebly.com/uploads/1/3/1/4/131455019/665942.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/tapirozonomerov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422906/normal_5ff071c5d99ea.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/marshall_valvestate_2000_avt_150_half_stack.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/63946696571.pdfIn PDF document text
    • http://nibewubixela.getenjoyment.net/zorojaxevomewon.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/42154354130.pdfIn PDF document text
    • https://kudilasiwutoxe.weebly.com/uploads/1/3/5/3/135314551/b224e96cdc1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_f5ee0b6ab72b4dfcb951361a9caceef8.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_1de9f65ba45d447f906188905ac55952.pdf?index=trueIn PDF document text
    • http://legokejapo.atwebpages.com/21998210226.pdfIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_44dff6e7318348f796f458303f612b8b.pdf?index=trueIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_8b37021678a149b18476d52ac66fcb26.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 5560 bytes
SHA-256: a5f257100d462705ac100aefee090fa9533918658310a50b90dfcf8051dc6709
font_01_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 10208 bytes
SHA-256: a24688bd7f2e88dc5a8f3378a99e7fa448a309c6b20f0805fa10e4f42a0fabf9

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